CHARAKTERYSTYKA WYBRANYCH OSUWISK Z TERENU POŁUDNIOWEJ POLSKI UAKTYWNIONYCH PO OKRESIE INTENSYWNYCH OPADÓW W 2010 ROKU

Abstract

DESCRIPTION OF SELECTED LANDSLIDES FROM SOUTHERN POLAND ACTIVATED AFTER INTENSIVE RAINFALL IN 2010

Abstract. The article presents the results of the research which was carried out on 74 landslides in southern Poland. The landslides generated or reactivated after a rainfall in 2010. Most landslides caused signifi cant losses in residential buildings and infrastructure, which in case of further development and no appropriate countermeasures, may cause serious problems for the economy. The investigations on each landslide included: measurements of geometric parameters (length, width, angle of inclination of the slope and the niche, etc.), assessment of geomorphological and geological conditions, determination of the soil type, the arragement of soil layers, the type of the landslide, the presence of surface water and groundwater, and slope exposure. An attention was paid also to the engineering-geological conditions of landslides formation, damages caused by the mass movement and threats. The protection works were also described. The
results showed that most of analyzed landslides has an area exceeding one thousand m² and the angle of inclination over 20°. In 52% of cases the impact of anthropogenic factors was noticed. These were mainly: additional loading of slope by an embankment or other construction, undercutting by road excavation and errors in design. Natural causes are mainly associated with the impact of the rainwater, which has caused changes in surface water and groundwater conditions.